Friday

October 28, 2016
Total # Posts: 2,453

**Calculus**

Find parametric equations for the tangent line to the curve with the given parametric equations at the specified point. x = 5 ln t, y = 8sqrt(t), z = t^5 (0,8,1) (x(t),y(t),z(t))=( )

*September 12, 2016*

**Maths**

A curve is such that dy/dx = 2- 8(3x+4)^-1/2 - A point P moves along the curve in such a way that the x-coordinates is increasing at a constant rate of 0.3 units per second. Find the rate of change of the y-coordinates as P crosses at the y-axis.

*September 10, 2016*

**Calculus**

a) Find parametric equations for the line through (4, 1, 4) that is perpendicular to the plane x − y + 2z = 7. (Use the parameter t.) b) In what points does this line intersect the coordinate planes? xy-plane? yz-plane? xz-plane?

*September 5, 2016*

**Calculus**

Consider the following planes. 5x − 4y + z = 1, 4x + y − 5z = 5 a) Find parametric equations for the line of intersection of the planes. b) Find the angle between the planes

*September 5, 2016*

**Calculus**

Find (a cross b)dot product a? & Find the cross product(a × b) dot product b? a = 1, 1, −1 b = 4, 8, 10

*September 5, 2016*

**Calculus**

I can not seem to get this right Find an equation of a sphere if one of its diameters has endpoints (5, 5, 5) and (7, 7, 7).

*September 5, 2016*

**Calculus**

Just needed a refresher. Thanks.

*September 4, 2016*

**Calculus**

Write the equation of the sphere in standard form. x2 + y2 + z2 + 4x − 2y − 2z = 19

*September 4, 2016*

**Calculus**

Find, correct to the nearest degree, the three angles of the triangle with the given vertices. A(0, 1, 3), B(-2, 4, 5), C(1, 4, -3), ∠CAB = ° ∠ABC = ° ∠BCA = °

*September 4, 2016*

**Chemistry**

How many electrons in CH3NH3+ ?

*September 1, 2016*

**Chemistry**

thanks guys!

*September 1, 2016*

**Chemistry**

Dissolved 0.7500 g calcium chloride dihydrate and impure, in distilled water and the volume was elevated to 200.00 mL in a volumetric flask. A rate of 10.00 mL of the same consumed the titration 18.9 mL 0.0125 M EDTA using CALCON as indicator. What is the purity of the salt...

*August 26, 2016*

**biology**

Helper is correct.

*August 23, 2016*

**American Government**

Becky2theg is correct (I only say her because she cited the questions as well as the answers)

*August 21, 2016*

**American Government**

It is C

*August 21, 2016*

**Chemistry**

What is the oxidation state of Cr in K2Cr2O4?

*August 19, 2016*

**check my work**

Just took this -- 100% 1-B 2-D 3-B 4-C

*August 19, 2016*

**Chemistry**

How do you calculate alkalinity in chemistry? Ex: List the values for total alkalinity for Sample A and Sample B A 104 drops of titrant (5.25mL) 3 drops of C20 H14 O4 B 81 drops of titrant (4.25mL) 3 drops od C20 H14 O4

*August 15, 2016*

**Math**

Update #2: I've figured it out! You're supposed to multiply the answer from part a with whatever the n value is (in this case it's 16 because 8x2), and then you add the down payment. Thanks to anyone who considered this question! Haha

*August 5, 2016*

**Math**

Update: I've got parts a and c correct! But I'm still having difficulty with part b - I multiplied the answer from part a with the number of years and then added the down payment, but that isn't correct. I'm not really sure what I'm doing wrong.

*August 5, 2016*

**Math**

A man buys a house for $310,000. He makes a $150,000 down payment and amortizes the rest of the debt with semiannual payments over the next 8 years. The interest rate on the debt is 11%, compounded semiannually. (a) Find the size of each payment. (b) Find the total amount paid...

*August 5, 2016*

**Math**

A $20,000 loan is to be amortized for 10 years with quarterly payments of $763.55. If the interest rate is 9%, compounded quarterly, what is the unpaid balance immediately after the sixth payment?

*August 5, 2016*

**Math**

Suppose an individual makes an initial investment of $1100 in an account that earns 7.3%, compounded monthly, and makes additional contributions of $100 at the end of each month for a period of 12 years. After these 12 years, this individual wants to make withdrawals at the ...

*August 5, 2016*

**Math**

Suppose you are offered a job with a relatively low starting salary but with a $2000 raise for each of the next 9 years. How much more than your starting salary would you be making in the ninth year?

*August 5, 2016*

**Math**

A student has a savings account earning 6% simple interest. She must pay $1650 for first-semester tuition by September 1 and $1650 for second-semester tuition by January 1. How much must she earn in the summer (by September 1) in order to pay the first-semester bill on time ...

*August 5, 2016*

**Math**

(a) To buy a Treasury bill (T-bill) that matures to $10,000 in 12 months, you must pay $9700. What rate does this earn? (b) If the bank charges a fee of $20 to buy a T-bill, what is the actual interest rate you earn?

*August 5, 2016*

**Calculus**

Does the series converge? diverge? Use the Root test ((1/n)-(1/n^2))^n

*August 1, 2016*

**MATH**

Does the series converge or diverge? Use the Root test ((1/n)-(1/n^2))^n

*August 1, 2016*

**math**

Does the series converge or diverge? Use the Root test ((1/n)-(1/n^2))^n

*July 31, 2016*

**math**

Does the series converge? Explain please 1/(ln 2)^n from n=1 to infinity

*July 31, 2016*

**Math**

Does the series converge or diverge (-1)^n * 4n^3 _______________(fraction) n^4 + 1 from n=1 to infinity

*July 31, 2016*

**math**

does an=(-1)^n converge? Explain

*July 31, 2016*

**MATH**

Does the series converge or diverge? Use the comparison test. Thank you ((1/n)-(1/n^2))^n

*July 31, 2016*

**MATH**

Series converges? or diverges? Which test? explain? (n^10) * (3^n) ------------(fraction) (4^n) from n=1 to infinity

*July 31, 2016*

**MATH**

Sum? from n=3 to infinity ((2)/(n+1)-(2)/(n+3))

*July 31, 2016*

**MATH**

Series converges? or diverges? Which test? explain? (-1)^n * (4n^3) ------------(fraction) (n^4) + 1

*July 31, 2016*

**Math**

Is the following series convergent? explain ((2n)!)/((n!)(4^n))

*July 30, 2016*

**MATH**

Does the sequence converge? Work out a=-1^n

*July 29, 2016*

**math**

10th floor

*July 28, 2016*

**MATH**

Solve the integral using trig substitution (1/((x)(x^2+1)))dx

*July 24, 2016*

**MATH**

Integrate 1/(x(x^2+1)) dx using trig substitution

*July 24, 2016*

**Math**

Evaluate the integral using u substitution ((y^3)/((1-y^2)^2))dy

*July 24, 2016*

**Calculus**

A tank in the shape of a right circular cylinder is filled with water (62.5 lb/ft3). It has a height of 8 ft and a diameter of 10 ft. How much work is required to pump all the water to a spout that is 3 ft above the top of the tank?

*July 18, 2016*

**calculus**

A tank in the shape of a right circular cylinder is filled with water (62.5 lb/ft3). It has a height of 8 ft and a diameter of 10 ft. How much work is required to pump all the water to a spout that is 3 ft above the top of the tank?

*July 18, 2016*

**calculus**

A region is bounded by y=2x and y=4sqrt(x). Find the volume when rotated along 1)y=-1 2)the y axis

*July 18, 2016*

**math**

The region in the first quadrant bounded by the 𝑦-axis and the curve 𝑥 = 2𝑦2 − 𝑦3 (graph please) is revolved about the 𝑥-axis. Find the volume?

*July 17, 2016*

**Calculus**

A tank in the shape of a right circular cylinder is filled with water (62.5 lb/ft3). It has a height of 8 ft and a diameter of 10 ft. How much work is required to pump all the water to a spout that is 3 ft above the top of the tank?

*July 17, 2016*

**Economics**

hey writeacher, you will really get from me one day. You are acting over smart. I will smack you.

*July 13, 2016*

**math**

What is the height of a cylinder with a volume of 384π cubic inches and a radius of 8 inches? Round to the nearest tenth of an inch.

*July 13, 2016*

**Physics**

A guitar string is 108 cm long and has a mass of 2.90 g. From the bridge to the support post (L) is 70 cm, and the string is under a tension of 470 N. What is the frequency of the first overtone? Only 1 try left please help.

*July 7, 2016*

**Physics**

Two identical loudspeakers are some distance apart. A person stands 5.70 m from one speaker and 3.00 m from the other. What is the second lowest frequency at which constructive interference will occur at this point? The speed of sound in air is 343m/s. only 1 try left please ...

*July 7, 2016*

**MATH HELP**

A bus leaves a station at 10am and averages 60 mph. Another bus, traveling at 75 mph, leaves the same station 30 mins later following the same route. What time does the second bus catch up with the first bus? I don't know how to work this out at all!

*July 6, 2016*

**Math**

Make four 8s equal 8

*July 2, 2016*

**Maths**

At 3 pm ship A is 20 nautical miles south west of ship B. Assuming that the y- direction is north and the x-direction is east, the velocities of ships A and B can be expressed in knots in vector form as Va=(12,+5) Vb=(-8,-9) (i) Find the velocity of ship B relative to ship A

*June 28, 2016*

**algebra**

Two investments totaling $49,500 produce an annual income of $1770. One investment yields 2% per year, while the other yields 4% per year. How much is invested at each rate?

*June 28, 2016*

**Physics**

A water balloon launcher launches a balloon straight up at a flying kite. If the kite is hovering 75.0 meters off the ground, and the balloon hits it on its upward trajectory with a velocity of 12.2m/s, a) What was the launch velocity of the balloon

*June 19, 2016*

**physics**

A 5.0 m portion of wire carries a current of 8.0 A from east to west. It experiences a magnetic field of 6.0 × 10^–4 T running from north to south. What is the magnitude and direction of the magnetic force on the wire? 2.4 × 10^–2 N upward 2.4 × 10...

*June 13, 2016*

**Chemistry**

Consider the compounds 4-tert-butylcyclohexanol and 4-tert-butylcyclohexanone. Using silica gel plates, which of the two compounds will have the higher Rf value when ethyl acetate is the developing solvent? Which will have the higher Rf value when dichloromethane is the ...

*May 30, 2016*

**Math**

Which ordered pair is not a solution of y= -4x -9 A(-9,27) B(3,-21) C(-6,15) D(5,-28) I have no idea how to do this help please

*May 26, 2016*

**Math**

Which is equivalent to this expression -4(-3x)+5(-7) A. -12x + 35 B. 12x - 35 C. -7x + 12 D. 7x - 12 Which is equivalent to the inequality shown below? X/2 </= -15 A. X >/= 7.5 B X </= 7.5 C X >/= -30 D X </= -30

*May 25, 2016*

**Math**

Write a variable on both sides that has infinite solutions.

*May 24, 2016*

**CIVICS PLS HELP MS. SUE**

Then my second choice would be C. if it isnt correct can you please explain to me?

*May 20, 2016*

**CIVICS PLS HELP MS. SUE**

ich of the following best illustrates the government's role in controlling financial institutions? A. The government directly influences the price of stocks in the stock market by taxing purchases of stock. B. The government limits the amount of loans that individuals can ...

*May 20, 2016*

**math**

@Mrs.Sue

*May 20, 2016*

**math**

Mrs.Sue please help

*May 20, 2016*

**math**

There are 9 candidates running for 3 seats on a committee. How many different election results are possible? A. 36 B. 84 C. 504 D. 56

*May 20, 2016*

**Math **

Anita can clean a typical pool in 8 hours. Chao can clean a typical pool in 6 hours. How long should it take Anita and Chao working together to clean a typical pool? I'd like to know how to work out this problem in order to find the answer.

*May 17, 2016*

**math**

The pressure P, of a gas varies inversely with its volume, V. Pressure is measured in units of Pa. Suppose that a particular amount of a gas is initially at a pressure of 84 Pa at a volume of 36 L. If the volume is expanded to 216 L, what will the new pressure be? I don't ...

*May 17, 2016*

**Chemistry**

A solution contains H2O2 in water. Complete decomposition of the H2O2 in 170 g of this solution yields 5.6 L of O2(g), measured at 0 oC and 101.325 kPa. What is the percentage by mass of H2O2 in this solution? Choose the closest answer. A 10% B 20% C 5.0% D 3.0% E 1.0%

*May 17, 2016*

**Chemistry **

Determine how many grams of Al must react with 2.5 M NaOH in order to produce 40 mL of hydrogen gas at 22°C and 1.02 bar

*May 17, 2016*

**check english please.. romeo and juliet**

Read this excerpt from the prologue to act II of Romeo and Juliet: CHORUS: Now old desire doth in his death-bed lie, And young affection gapes to be his heir; That fair for which love groan'd for and would die, With tender Juliet match'd, is now not fair. Now Romeo is ...

*May 17, 2016*

**Walk Two Moons**

Has anyone read the story walk two moons? If so, please help. where does Sal BEGIN to realize that her mother is really not returning? A) Lake Michigan B) Madison Wisconsin C) Pipestone Minnesota *** D) Sioux Falls, South Dakota please help, I've read the book and tryed ...

*May 14, 2016*

**Pre Algebra**

Is anyone from connexus academy who took the Unit 4 Lesson 7 Polynomials and Properties of Exponents Unit Test?? I need help on the first question...

*May 13, 2016*

**calculus**

Find the area of the region bounded by the graph of f(x)=x(x+3)(x+1) and the x-axis on the interval [-3,0]

*May 12, 2016*

**history**

Evaluate one viewpoint on each of the following in the Andes and the Pampas: the environment, globalization and the economic growth

*May 12, 2016*

**Language Arts**

and is the second question c?

*May 12, 2016*

**Language Arts**

the first one is b then right?

*May 12, 2016*

**Language Arts**

Under a spreading chestnut tree The village smithy stands; The smith, a mighty man is he, With large and sinewy hands; And the muscles of his brawny arms Are strong as iron bands. His hair is crisp, and black, and long, His face is like the tan; His brow is wet with honest ...

*May 12, 2016*

**History**

I'm looking for globalization in the Andes. I'm not looking for answers just maybe a link for help or something? thanks.

*May 12, 2016*

**History**

How does elevation impact ecosystems in South America A. Farmers can grow different crops at different elevations (this one?) B. Plants do not grow above the tree line C. Animals can't live in higher evelations D. Humans settle only in the lowest elevations

*May 12, 2016*

**calculus 1**

Set up the simplified integral and compute the volume created when the area bounded by y=.25x4, y=4, and the y=axis (Quadrant 1) is rotated around the line x=-2

*May 11, 2016*

**Chemistry**

5.88 moles of nitrogen and 16.2 moles of oxygen are mixed until the equilibrium is established, 11.28 moles of nitric oxide are formed calculate the value of equilibrium constant

*May 11, 2016*

**Social Studies**

Blop is correct, I got 100%

*May 11, 2016*

**Physics**

Three dynamics carts have force sensors placed on top of them.(cart 1, with mass of 2.2 kg, has one sensor --> cart 2, with mass of 2.5 kg, has sensors two and then three --> cart 3, with mass of 1.8 kg, has sensors four then five). Each force sensor is tied to a string ...

*May 7, 2016*

**MATH HELP ASAP**

For questions 1–4, find the slope of the following graphs. 1. a. 1/2 b. 2 c. 2 d. -1/2 2. a. 3/2 b. 1 c. -1 d. -3/2 3. a. 2/3 b. 3/2 c. 3 d. -2/3 4. a. 0 b. 1 c. -1 d. undefined For questions 5 and 6, find the slope of the line that goes through the following points. 5. x...

*May 4, 2016*

**HELP MATH ASAP**

For questions 1–4, find the slope of the following graphs. 1. (1 point) 2 –2 – 2. (1 point) 1 –1 – 3. (1 point) 3 – 4. (1 point) 0 1 –1 undefined For questions 5 and 6, find the slope of the line that goes through the following points. 5. (1 ...

*May 4, 2016*

**MATH HELP ASAP**

i don't know i need help

*May 4, 2016*

**MATH HELP ASAP**

identify the sequence as arithmetic, geometric, or neither. please explain answer 1.6,0.8, 0.4, 0.2,...

*May 4, 2016*

**MATH HELP ASAP**

algebraic

*May 4, 2016*

**MATH HELP ASAP**

use the expression to find the value of the 20th term. a. 24 b. 76 c. 80 d. 84

*May 4, 2016*

**algebra**

which algebraic expression represents the sequence shown 4,8,12,16,... a. 4n b. n + 4 c. 4n + 4 d. 4 ( n-1)

*May 4, 2016*

**alegbra help asap **

what are the first 4 terms in the sequence represented by the expression 2n + 3? a. 2,5,8,11 b. 4,5,6,7 c. 5,7,9,11 d. 5,10,15,20

*May 4, 2016*

**PLEASE HELP ASAP ALGEBRA**

indentify the sequence as arithmetic, geometric, or neither. 3,4.5,6,7.5,... a. arithmetic b. geometric c. neither please help i don't know the answer

*May 4, 2016*

**PLEASE HELP ASAP**

a. 9 b. 11.5 c. 15 d. 19.5

*May 4, 2016*

**PLEASE HELP ASAP**

which values will be part of the sequence? 3,4.5,6,7.5,...

*May 4, 2016*

**MATH HELP ASAP**

identify the sequence as arithmetic, geometric, or neither 3, 4.5,6,7.5,...

*May 3, 2016*

**PLEASE HELP ASAP ALGEBRA**

A spinner is divided into 10 equal sections numbered from 0 to 10. you spin the spinner once. what is P ( divisible by 3)? a. 1/3 b. 1/2 c. 2/5 d. 3/10 my answer is d, is that correct?

*May 3, 2016*

**PLEASE HELP ASAP**

Im asking if that's correct

*May 3, 2016*

**PLEASE HELP ASAP**

1.Justin writes the letters I-L-L-I-N-O-I-S on cards and then places the card in a hat. What are the odds in favor of picking an I? a. 5:3 b. 3:5 c. 3:7 d. 1:2 my answer is b? 2. Justin writes the letters I-L-L-I-N-O-I-S on cards and then places the cards in a hat. What are ...

*May 3, 2016*